@ Azguy - I don't believe that for one minute. If Gotti kept refusing to give the tapes, Castellano could of easily sent DeMeo or any other hotshot killer for that matter or could address The Commission. If someone refused once to Big Paul Castellano, They wouldn't be alive the next morning.
John didn't like Castellano. Gotti wanted to become boss, earn a little more and have more power. Sit on The Commission and be somebody. I guess he didn't like being told what to do.